Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5179ba9702c515…

MALICIOUS

PDF

47.3 KB Created: 2020-04-09 20:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6673342d5b7ba62e7d9a16be32cf7d74 SHA-1: 14b8a40dc8034330d7e98770682ac6f1e704cf3c SHA-256: 6e5179ba9702c51549c542805612419688bb543269251fb2458bbec740e433fd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The document body, though partially corrupted, contains references to a book title and the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness, and the presence of numerous external URLs points towards a campaign to drive traffic or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://holanomadas.com/uploads/1/3/0/3/130323518/130323518.html#memory+man+david+baldacci+pdf
    • http://winstonandfidel.com/uploads/1/3/0/9/130969586/d54cfcb02.pdf
    • http://evelynhsullivanmediation.com/uploads/1/3/0/4/130476697/nalev_wedapexokak_zukujewojiki_kafunusomak.pdf
    • http://william-rinn.net/uploads/1/3/0/7/130776791/44f5647ab49b47.pdf
    • http://theuglypeacock.com/uploads/1/3/0/5/130550890/pumupalajitotavugi.pdf
    • http://jenniferritaahern.com/uploads/1/3/1/4/131437436/4301407.pdf
    • http://stephanieriley.net/uploads/1/3/0/5/130552034/wofetawu.pdf
    • http://mrsmithsclasses.com/uploads/1/3/1/4/131409024/kazanebovoko_risipexalovufo_bumomakava.pdf
    • http://condonarchitecturalhardware.com/uploads/1/3/0/5/130550823/e39897f77c69.pdf
    • http://qualityapplianceslacey.com/uploads/1/3/0/8/130814674/napam_nesijokiperet_xarokegerewijil.pdf
    • http://mybattlefieldlife.com/uploads/1/3/0/7/130776200/nogobetigixal.pdf
    • http://topcoatdesign.net/uploads/1/3/0/7/130775180/torexozinaxid_berezevegaxon.pdf
    • http://selectdemanuel.com/uploads/1/3/0/8/130813985/7cb5a58d2647b39.pdf
    • http://paulcurryelectrics.com/uploads/1/3/1/4/131406207/tozaselu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008747.bin
b32280e40251ed7d1688183e9961eb23e524c77d4e301ac5006bcf4e6a4e0a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8747 7900 bytes
font_01_sfnt_off0000a625.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA625 2484 bytes

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